ABSTRACT

NASA is designing an unmanned submarine to explore the hydrocarbon rich seas of Saturn s moon Titan. Titan is the only known celestial body in our solar system other than Earth with stable liquid lakes on its surface. The thermodynamic properties of Titan's seas have not been well characterized. This work investigates the solubility of nitrogen in varying liquid methane-ethane compositions and the effects of dissolved nitrogen on the density of the sea. Twenty-one pressure-density-temperature-composition (P(rho)T-x) measurements are presented from 92 K to 96 K for pressures from 1 bar to 11 bar for varying compositions of methane, ethane, and nitrogen. These measurements are being used to aid in thermodynamic modeling of the Titan seas as well as the design of the Titan Submarine.

Compounds

#	Formula	Name
1	CH4	methane
2	C2H6	ethane
3	N2	nitrogen

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1 2 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 1; Liquid Mole fraction - 3; Liquid		Liquid	Buoyancy - hydrostatic balance with magnetic suspension - one sinker	18
POMD	2 3	Mass density, kg/m3 ; Liquid	Pressure, kPa; Liquid Mole fraction - 2; Liquid	Temperature, K; Liquid	Liquid	Buoyancy - hydrostatic balance with magnetic suspension - one sinker	2
POMD	1 3	Mass density, kg/m3 ; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid Temperature, K; Liquid		Liquid	Buoyancy - hydrostatic balance with magnetic suspension - one sinker	1

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Experimental P(rho)T-x measurements of liquid methane-ethane-nitrogen mixtures

Richardson, I.A., Hartwig, J.W., Leachman, J.W.

ABSTRACT